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conic tangent point question - conic tanget points ???
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Art Smith  
#1 Posted : Saturday, May 28, 2016 3:11:06 PM(UTC)
Art Smith

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does anyone have any ideas on how to impose/define tangent points with Shark FX9's conic tools?? I have a start point, end point, and slope at the end point; the end point NOT being at 90 degrees from the start point............. see attached cartoon

Art
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24c  
#2 Posted : Sunday, May 29, 2016 12:27:41 AM(UTC)
24c

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Hi Art,

The tangent tool is no different for any curve as far as I know.

Select the line tool, take a point on the conic away from the tangent area, hover the cursor over the conic, click and drag and as you do so the words "tangent" will appear and as you move the cursor (left in your case) the tangent line will drag along the curve and when your happy you click again, and the tangential line is drawn.

I think I misunderstood your post slightly in my above response, but it seems you want the tangent to start from a specific intersection point?
If you create an intersection point and zoom in that area and with the line tool selected, slowly move the cursor to create a tangent at the intersect point, cursor reports "on" "on" "intersect" as you drag.

Mike

EDIT That didn't seem to work as well as I wanted,so I eventually drew a short line from the intersection and traced onto the conic. Then I drew a second line that was tangential to the short line...best I could do. :)

Edited by user Sunday, May 29, 2016 12:53:53 AM(UTC)  | Reason: Not specified

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Art Smith  
#3 Posted : Sunday, May 29, 2016 1:04:19 AM(UTC)
Art Smith

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Mike-

thanks for your thoughts. in my situation the line and the start point are "givens". the desired tangent point is the end of the line. using the "Two Point Conic" the start point is selected and the mouse moved/dragged to select the end of the ellipse's major axis. when the mouse is in motion I get no feedback other than the evolving conic; ie: no tangent or end point or ...l.. as best I can tell all of the other conic/ellipse options require prior knowledge of "a" and "b"

Art
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murray  
#4 Posted : Sunday, May 29, 2016 8:29:11 AM(UTC)
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Draw a rectangle using the normal as the base. The middle point of a three-point conic will lie on the side of the rectangle.
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impose normal on conic end point.JPG (24kb) downloaded 11 time(s).

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thanks 1 user thanked murray for this useful post.
Art Smith on 5/29/2016(UTC)
Art Smith  
#5 Posted : Sunday, May 29, 2016 9:39:06 AM(UTC)
Art Smith

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Murray-

a huge thanks to you!! your construction gets me something that can be used to parametrically converge on what's needed.

Art
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